![]() ![]() Revised controls – additional button for RIT/XIT, modified functions of the other buttons and the encoder. ![]() TX signal input, so the micro actually knows when to apply the XIT offset.RIT/XIT offsets – allow to fine tune/offset the frequency from the one displayed by ☒5kHz, in selectable steps.The main features of this version of the hardware: The version of the VFO described in this post is based on the original design from my previous post, so you may want to read that first, especially some of the design rationale and gotchas commonly encountered with the cheap AD9850/9851 DDS modules available from eBay and elsewhere. I have received quite a bit of feedback from several people, along with a few requests for improvements to make the hardware more suitable for HAM radio use (my original goal was a signal generator!). It has been some time since I have posted the article on building a simple VFO/signal generator using the AD9850 module and a microcontroller, originally based on the work Richard, AD7C.
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